HIGH-TEMPERATURE CRACK GROWTH IN CERAMIC MATERIALS SUBJECTED TO STATIC AND CYCLIC LOADS

S. Suresh        

Anales de la Mecánica de la Fractura, nº 9 . 1992 . Pág. 5 -11
Ver (.pdf): Anales09-001

Resumen: This paper provides an overview of sorne recent work on high temperature crack growth in ceramics and ceramic composites subjected to static and cyclic loads. First, general descriptions of mechanical fatigue effects in brittle solids are presented. Then, possible causes for mechanical fatigue effects in alumina-based ceramics and composites in the high temperature envíronment are discussed in terms of both crack-tip damage processes and crack wake effects. It is seen that crack growth rates under cyclic loads cannot, in general, be predicted solely on the basis of the known creep crack growth rates under static loads. Particular attention is focused on the effects on crack growth rates of the presence of intergranular and interfacial glass films, which either remain from the processing stage orare formed as a result of phase transformations in the high temperature environment.

LocalizaciónAiguablava, Gerona

Division of Engineering, Brown University. Providence, Rhode Island 02912, USA